Turret assembly for machines

ABSTRACT

A turret assembly for supporting a moveable boom assembly is disclosed. The turret assembly includes a base assembly structured and arranged for selective rotation. The turret assembly further includes a swing motor being attached to the base assembly. The swing motor has a housing portion projecting outward from the base assembly in a direction towards the boom assembly. The turret assembly further includes a mount assembly having a forward attachment portion, a rearward attachment portion and a hinge portion defined therebetween. The hinge portion of the mount assembly is configured to support the moveable boom assembly coupled thereto. The forward attachment portion and the hinge portion are structured and arranged to define a recess pocket. The swing motor is at least partially disposed within the recess pocket.

TECHNICAL FIELD

The present disclosure relates to a turret assembly for supporting amoveable boom assembly of a machine.

BACKGROUND

Machines, such as hydraulic excavators include a boom for performingvarious operations, such as an earth moving operation via implements,such as a bucket. The boom has a foot that is pivotally coupled to amounting bracket provided on a base assembly of the machine. The boom isactuated hydraulically to move up and down relative to the baseassembly. The machine also includes a swing drive disposed on anundercarriage system to move the base assembly relative to the undercarriage system. The swing drive is disposed in the under carriagesystem proximate to the mounting bracket. Based on applications andspecification of the machines, the swing drive may be disposed aroundthe mounting bracket at different locations. The swing drive has anupper portion that may project above a surface of the base assembly. Toprevent interference between the foot of the boom and the swing drive,the swing drive may have to be provided at selective locations on thebase assembly. This may cause restrictions in the location of the swingdrive, thereby causing complexity in the assembly and design of othercomponents.

JP Patent Publication Number 2006/316536 (the '536 publication)discloses a boom foot structure for a working machine. The '536publication discloses a boom having one end pivotally coupled with thebody of the working machine. The end of the boom is formed with a forkstructure to couple with a pair of mounting brackets provided on thebody. The fork structure is formed at the end of the boom to facilitatecoupling of the boom with the pair of mounting brackets via separate pinmembers. Further, the forked structure is integrally fabricated with abody of the boom.

SUMMARY OF THE DISCLOSURE

In one aspect of the present disclosure, a turret assembly forsupporting a moveable boom assembly is provided. The turret assemblyincludes a base assembly structured and arranged for selective rotation.The turret assembly further includes a swing motor being attached to thebase assembly. The swing motor has a housing portion projecting outwardfrom the base assembly in a direction towards the boom assembly. Theturret assembly further includes a mount assembly having a forwardattachment portion, a rearward attachment portion and a hinge portiondefined therebetween. The hinge portion of the mount assembly isconfigured to support the moveable boom assembly coupled thereto. Theforward attachment portion and the hinge portion are structured andarranged to define a recess pocket. The swing motor is at leastpartially disposed within the recess pocket.

In another aspect of the present disclosure, a machine is provided. Themachine includes a turret assembly for supporting a moveable boomassembly. The turret assembly includes a base assembly structured andarranged for selective rotation. The turret assembly further includes aswing motor being attached to the base assembly. The swing motor has ahousing portion projecting outward from the base assembly in a directiontowards the boom assembly. The turret assembly further includes a mountassembly having a forward attachment portion, a rearward attachmentportion and a hinge portion defined therebetween. The hinge portion ofthe mount assembly is configured to support the moveable boom assemblycoupled thereto. The machine further includes a foot member coupled tothe boom assembly and pivotally coupled to the hinge portion of themount assembly. The foot member is configured to define a recess so thatthe boom assembly provides a clearance with respect to the housingportion of the swing motor. The forward attachment portion and the hingeportion are structured and arranged to define a recess pocket. The swingmotor is at least partially disposed within the recess pocket.

In yet another aspect of the present disclosure, a turret assembly forsupporting a moveable boom assembly is provided. The turret assemblyincludes a base assembly structured and arranged for selective rotation.The turret assembly further includes a swing motor being attached to thebase assembly. the swing motor has a housing portion projecting outwardfrom the base assembly in a direction towards the boom assembly. Theturret assembly further includes a mount assembly having a forwardattachment portion, a rearward attachment portion and a hinge portiondefined therebetween. The hinge portion of the mount assembly isconfigured to support the moveable boom assembly coupled thereto. A footmember is coupled to the boom assembly and pivotally coupled to themount assembly in order to allow the boom assembly to move between afirst position and a second position relative to the base assembly. Inthe first position, the foot member is distal to the swing motor, and inthe second position, the foot member is proximate to the swing motor.The foot member includes a base portion and a first leg member extendingfrom the base portion. The first leg member is pivotally coupled to afirst mounting member of the mounting assembly. The foot member furtherincludes a second leg member spaced apart from the first leg member. Thesecond leg member is extending from the base portion and pivotallycoupled to a second mounting member of the mounting assembly. The firstand second leg members are configured to define a recess therebetween.The recess is adapted to at least partially accommodate the swing motortherein in the second position of the boom assembly. The swing motor isat least partially disposed between the hinge portion and the forwardattachment portion of each of the first and second mounting members.

Other features and aspects of this disclosure will be apparent from thefollowing description and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of an exemplary machine having a boom assembly;

FIG. 2 is a perspective view of the boom assembly coupled to a turretassembly of the machine, according to an embodiment of the presentdisclosure;

FIG. 3 is a perspective view of a foot member of the boom assembly ofFIG. 2, according to an embodiment of the present disclosure;

FIG. 4 is a perspective view of the boom assembly disposed proximate toa swing motor attached to a base assembly of the turret assembly,according to an embodiment of the present disclosure;

FIG. 5 is a side view of the base assembly showing a position of theswing motor with respect to a mount assembly attached to the baseassembly, according to an embodiment of the present disclosure; and

FIG. 6 is a side view of the base assembly showing another position ofthe swing motor with respect to the mount assembly, according to anotherembodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to specific embodiments orfeatures, examples of which are illustrated in the accompanyingdrawings. Wherever possible, corresponding or similar reference numberswill be used throughout the drawings to refer to the same orcorresponding parts.

FIG. 1 shows a side view of an exemplary machine 100. In the illustratedembodiment, the machine 100 is an excavator having a boom assembly 102.The boom assembly 102 is used for performing various operations, such asan earth moving operation. Further, the boom structure 102 is movablerelative to an undercarriage system 104 of the machine 100. The machine100 may be any machine having a boom assembly used for the purpose ofconstruction, mining, quarrying, and the like.

The machine 100 further includes an upper structure 106 and an operatorcab 108 rotatably supported on the undercarriage system 104 by a turretassembly 110. Further, the boom assembly 102 is moveably supported onthe turret assembly 110. The operator cab 108 includes one or moreoperator interface devices for controlling operation of the boomassembly 102 and/or the machine 100. In the illustrated embodiment, theundercarriage system 104 includes a pair of tracks. In variousembodiments, the upper structure 106 and the operator cab 108 may berotatably supported on a base structure having a plurality of wheels.

As shown in FIG. 1, the boom assembly 102 is movably coupled to a baseassembly 114 (shown in FIG. 2) of the turret assembly 110. The baseassembly 114 is structured and arranged for selective rotation thereof.The base assembly 114 is configured to support the upper structure 106and the operator cab 108. The boom assembly 102 includes a boom member112 coupled to the base assembly 114. The boom member 112 is movedrelative to the base assembly 114 using a first hydraulic actuator 116.The first hydraulic actuator 116 is coupled between the base assembly114 and the boom member 112. The boom member 112 is further pivotallycoupled to a stick member 118 via a pin member 120. A second hydraulicactuator 122 is coupled between the boom member 112 and the stick member118 to move the stick member 118 relative to the boom member 112. Aworking tool 124, such as a bucket is pivotally coupled to the stickmember 118. A third hydraulic actuator 126 is coupled between the stickmember 118 and the working tool 124 to move the working tool 124relative to the stick member 118. The machine 100 may further include ahydraulic system (not shown) in communication with the first, second andthird hydraulic actuators 116, 122, 126 to move the boom assembly 102relative to the upper structure 106.

FIG. 2 illustrates a perspective view of the boom assembly 102 coupledto the base assembly 114 of the machine 100, according to an embodimentof the present disclosure. The undercarriage system 104 includes a base128 for movably supporting the base assembly 114. The turret assembly110 includes a swing motor 130 attached to the base assembly 114. Theswing motor 130 is operably engaged with the base assembly 114 to movethe base assembly 114 relative to the undercarriage system 104 along anaxis ‘A’ defined by the swing motor 130.

The swing motor 130 includes a housing portion 132 disposed on a baseplate 134 of the base assembly 114. The housing portion 132 projectsoutward from the base assembly 114 in a direction along the axis ‘A’towards the boom assembly 102. The base plate 134 is coupled to the baseassembly 114 and moves relative to the base 128. The swing motor 130 mayfurther include a bottom portion (not shown) movably disposed within theturret assembly 110. The housing portion 132 of the swing motor 130 maybe engaged with the bottom portion to move the base assembly 114relative to the base 128. The housing portion 132 of the swing drive 130defines an outer circumference 136. In one example, the outercircumference 136 of the housing portion 132 is circular. However, invarious examples, the outer circumference 136 of the housing portion 132may be square, rectangular, elliptical, polygonal or any other shapeknown in the art. The housing portion 132 of the swing drive 130 furtherextends above an upper surface 138 of the base assembly 114. The uppersurface 138 of the base assembly 114 further includes a plurality ofreinforcing members to provide structural rigidity to the base assembly114. The base assembly 114 also includes a plurality of supportingmembers 139 for mounting various components of the machine 100including, but not limited to, an engine and a fuel tank. In thepreferred embodiment, based on the location of the engine and the fueltank, the housing portion 132 of the swing motor 130 is disposed on thebase plate 134 adjacent to a front end 137 of the base assembly 114. Inalternate embodiments, the housing portion 132 of the swing motor 130may be disposed adjacent to a rear end or sides of the base assembly114.

The turret assembly 110 further includes a mount assembly 140 coupled tothe base assembly 114. The mount assembly 140 includes a first mountingmember 142 extending from the upper surface 138 of the base assembly114. The mount assembly 140 further includes a second mounting member144 extending from the upper surface 138 of the base assembly 114. Thefirst and second mounting members 142, 144 are laterally spaced fromeach other. The first mounting member 142 includes a forward attachmentportion 142A, a rearward attachment portion 142B and a hinge portion142C defined therebetween. Similarly, the second mounting member 144includes a forward attachment portion 144A, a rearward attachmentportion (not shown) and a hinge portion (not shown) definedtherebetween. The hinge portions of the first and second mountingmembers 142, 144 are configured to be pivotally coupled to the boomassembly 102. The forward attachment portions 142A, 144A and the hingeportions of the first and second mounting members 142, 144 arestructured and arranged to define a recess pocket 143. The swing motor130 is at least partially disposed within the recess pocket 143.

The boom member 112 includes an elongate member 146 having a first end148 and a second end 149. The first end 148 of the elongate member 146is adapted to be coupled to the working tool 124 via the stick member118. In an embodiment, the elongate member 146 is fabricated from aplurality of metal plates. However, in various embodiments, the elongatemember 146 may be manufactured through any known manufacturing methodknown in the art.

The boom member 112 further includes a foot member 150 coupled to thesecond end 149 of the elongate member 146. The foot member 150 ispivotally coupled to the first and second mounting members 142, 144 toallow the boom assembly 102 to move between a first position P1 and asecond position P2 relative to the base assembly 114. In the firstposition P1, the foot member 150 is distal to the housing portion 132 ofthe swing motor 130. In the second position P2, the foot member 150 isproximate to the housing portion 132 of the swing motor 130. Moreover,the first position P1 of the boom member 112 may correspond to anextended position of the first hydraulic actuator 116 and the secondposition P2 may correspond to a retracted position of the firsthydraulic actuator 116. Referring to FIG. 2, the first position P1 ofthe boom member 112 relative to the base assembly 114 is shown.

In an embodiment, the foot member 150 is pivotally coupled to the firstand second mounting members 142, 144 via a first pin member 152 and asecond pin member 154, respectively. In an alternative embodiment, thefoot member 150 may be pivotally coupled to the first and secondmounting members 142, 144 via a single pin member.

FIG. 3 is a perspective view of the foot member 150, according to anembodiment of the present disclosure. The foot member 150 includes abase portion 156 coupled to the second end 149 of the elongate member146. The base portion 156 may define an outer circumference 158substantially similar to an outer circumference (not shown) defined atthe second end 149 of the elongate member 146. The base portion 156includes a protrusion 160 configured to be received through a hollowspace (not shown) defined at the second end 149 of the elongate member146. The protrusion 160 may extend from the base portion 156 adjacent tothe outer circumference 158 thereof. The outer circumference 158 of thebase portion 156 may align with the outer circumference of the secondend 149 of the elongate member 146, once the protrusion 160 is receivedthrough the second end 149 of the elongate member 146. In theillustrated embodiment, the base portion 156 is welded to the second end149 of the elongate member 146. In various embodiments, the base portion156 may be coupled to the elongate member 146 via fastening members,such as bolts and nuts. It may also be contemplated that the baseportion 156 may be integrally formed with the second end 149 of theelongate member 146.

The base portion 156 further includes an upper base portion 162 and alower base portion 164 distal to the upper base portion 162. The upperbase portion 162 extends from a top side 166 adjacent to the outercircumference 158 of the base portion 156. Similarly, the lower baseportion 164 extends from a bottom side 168 adjacent to the outercircumference 158 of the base portion 156. The upper and lower baseportions 162, 164 are configured to define a second space 170therebetween. In an example, one or more hydraulic valves used foractuation of the boom assembly 102 may be disposed within the secondspace 170.

The foot member 150 further includes a first leg member 172 configuredto be pivotally coupled to the first mounting member 142 of the baseassembly 114. The first leg member 172 extends from the base portion 156and configured to be detachably coupled to the first mounting member 142via the first pin member 152. The foot member 150 further includes asecond leg member 174 spaced apart from the first leg member 172. Thesecond leg member 174 is configured to be pivotally coupled to thesecond mounting member 144 of the base assembly 114. The second legmember 174 extends from the base portion 156 and configured to bedetachably coupled to the second mounting member 144 via the second pinmember 154. The first and second leg members 172, 174 are configured todefine a recess 176 therebetween. The recess 176 of the boom assembly102 is configured to define a clearance ‘C’ (shown in FIG. 6) withrespect to the housing portion 132 of the swing motor 130. The recess176 is adapted to at least partially accommodate the housing portion 132of the swing motor 130 therein in the second position P2 of the boommember 112.

Each of the first and second leg members 172, 174 includes a pair ofarms 178 configured to be detachably coupled with the first and secondmounting members 142, 144, respectively. The pair of arms 178 of thefirst leg member 172 is described in detail. Each of the pair of arms178 includes a hole 180. The holes 180 are adapted to receive the firstpin member 152 therethrough. Further, each of the pair of arms 178 islaterally spaced from each other to define a width that is greater thana thickness of the first mounting member 142, such that the firstmounting member 142 may be disposed between the pair of arms 178 toalign a hole (not shown) of the first mounting member 142 with the holes180 of the pair of arms 178. Similarly, the pair of arms 178 of thesecond leg member 174 includes the holes 180 to receive the second pinmember 154 therethrough.

The boom member 112 further includes a first upper beam 182 extendingbetween the upper base portion 162 and the first leg member 172 and asecond upper beam 184 distal to the first upper beam 182. The secondupper beam 184 extends between the upper base portion 162 and the secondleg member 174. The upper base portion 162, the first upper beam 182,the second upper beam 184, the first leg member 172 and the second legmember 174 together define a first inner circumference 186.

The boot member further includes a first lower beam 188 extendingbetween the lower base portion 164 and the first leg member 172 and asecond lower beam 190 distal to the first lower beam 188. The secondlower beam 190 extends between the lower base portion 164 and the secondleg member 174. The lower base portion 164, the first lower beam 188,the second lower beam 190, the first leg member 172 and the second legmember 174 together define a second inner circumference 192. The firstinner circumference 186 and the second inner circumference 192 aregreater than the outer circumference 136 defined by the housing portion132 of the swing motor 130 to receive the housing portion 132 of theswing motor 132 therein.

FIG. 4 illustrates a perspective view of a portion of the boom assembly102 disposed proximate to the swing motor 130, according to anembodiment of the present disclosure. When an operator actuates thefirst hydraulic actuator 116 to the retracted position thereof, the boomassembly 102 moves to the second position P2. While the boom assembly102 moves to the second position P2, the outer circumference 136 definedby the housing portion 132 of the swing motor 130 is received within therecess 176 defined by the foot member 150. Further, the first and secondinner circumferences 186, 192 of the foot member 150 may define theclearance ‘C’ with the outer circumference 136 of the housing portion132 of the swing motor 130. The clearance ‘C’ is designed in such a waythat the housing portion 132 of the swing motor 130 may be freelydisposed within the recess 176 without interfering with surroundingsurface of the swing motor 130.

FIGS. 5 and 6 illustrate various locations of the swing motor 130 withrespect to the mount assembly 140. Referring to FIG. 5, the swing motor130 is fully received within the recess pocket 143 defined by theforward attachment portions 142A, 144A and the hinge portions of thefirst and second mounting members 142, 144, respectively. In such acase, the housing portion 132 of the swing motor 130 may be partiallyreceived within the recess 176 defined by the foot member 150 at thesecond position ‘P2’ of the boom assembly 102. Referring to FIG. 6, theswing motor 130 is partially received within the recess pocket 143. Insuch a case, the housing portion 132 of the swing motor 130 may be fullyreceived within the recess 176 at the second position ‘P2’ of the boomassembly 102.

INDUSTRIAL APPLICABILITY

The present disclosure relates to the turret assembly 110 and the footmember 150 coupled to the second end 149 of the elongate member 146. Thefoot member 150 is movably coupled to the first and second mountingmembers 142, 144 of the mount assembly 140 to move the boom assembly 102between the first position P1 and the second position P2. The recess 176defined between the first inner circumference 186 and the second innercircumference 192 of the foot member 150 may accommodate the housingportion 132 of the swing motor 130 in the second position P2 of the boommember 112.

In the illustrated embodiment, the foot member 150 is a casting member.The pair of arms 178 of each of the first and second leg members 172,174 may be further machined to define the holes 180 and the width todetachably couple with the first and second mounting members 142, 144,respectively, of the mount assembly 140. Further, the base portion 156may also be machined to couple with the second end 149 of the elongatemember 146. The upper base portion 162, the lower base portion 164, thefirst upper beam 182, the second upper beam 184, the first lower beam188, the second lower beam 190, the first leg member 172 and the secondleg member 174 are formed by single piece casting member to reduceweight of the foot member 150. Thus, development cost of the foot member150 may be reduced.

As the foot member 150 is separately casted and coupled to the secondend 149 of the elongate member 146, scrapping of the elongate member 146due to damages, such as a wear or a crack formed in the first and thesecond leg members 172, 174 after prolonged operation of the machine 100may be minimized by replacing with a new foot member 150 at the secondend 149 of the elongate member 146 with less or no modification in theelongate member 146.

In various examples, the swing motor 130 may be disposed either at thefront end 137, the rear end or sides of the base assembly 114. Hence,with the foot member 150 of the present disclosure, the base assembly114 may be commonized for machines having same specification ordifferent specification. Thus, development cost and inventory cost ofthe base assembly 114 may be reduced or eliminated.

While aspects of the present disclosure have been particularly shown anddescribed with reference to the embodiments above, it will be understoodby those skilled in the art that various additional embodiments may becontemplated by the modification of the disclosed systems and methodswithout departing from the spirit and scope of what is disclosed. Suchembodiments should be understood to fall within the scope of the presentdisclosure as determined based upon the claims and any equivalentsthereof.

What is claimed is:
 1. A turret assembly for supporting a moveable boomassembly, the turret assembly comprising: a base assembly structured andarranged for selective rotation; a swing motor being attached to thebase assembly and having a housing portion projecting outward from thebase assembly in a direction towards the boom assembly; and a mountassembly having a forward attachment portion, a rearward attachmentportion and a hinge portion defined therebetween, the hinge portion ofthe mount assembly configured to support the moveable boom assemblycoupled thereto; wherein the forward attachment portion and the hingeportion being structured and arranged to define a recess pocket, theswing motor being at least partially disposed within the recess pocket.2. The turret assembly of claim 1 further comprising a foot membercoupled to the boom assembly, the foot member defines a recess so thatthe boom assembly provides a clearance with respect to the housingportion of the swing motor.
 3. The turret assembly of claim 1, whereinthe housing portion of the swing motor is completely enclosed within therecess pocket defined by the forward attachment portion and the hingeportion of the mount assembly.
 4. The turret assembly of claim 2,wherein the foot member comprises a first leg member and a second legmember configured to be pivotally coupled to the mount assembly.
 5. Theturret assembly of claim 4, wherein the mount assembly comprises: afirst mounting member configured to be detachably coupled to the firstleg member of the foot member; and a second mounting member configuredto be detachably coupled to the second leg member of the foot member. 6.The turret assembly of claim 2, wherein the foot member comprises a baseportion having an upper base portion and a lower base portion spacedapart from the upper base portion, and wherein the upper and lower baseportions are configured to define a second space therebetween.
 7. Theturret assembly of claim 6, wherein the foot member further comprises: afirst upper beam extending between the upper base portion and the firstleg member; and a second upper beam spaced apart from the first upperbeam and extending between the upper base portion and the second legmember; wherein the upper base portion, the first upper beam, the secondupper beam, the first leg member and the second leg member togetherdefine a first inner circumference.
 8. The turret assembly of claim 7,wherein the foot member further comprises: a first lower beam extendingbetween the lower base portion and the first leg member; and a secondlower beam spaced apart from the first lower beam extending between thelower base portion and the second leg member; wherein the lower baseportion, the first lower beam, the second lower beam, the first legmember and the second leg member together define a second innercircumference.
 9. The turret assembly of claim 8, wherein the firstinner circumference and the second inner circumference are greater thanan outer circumference defined by the housing portion of the swingmotor.
 10. The turret assembly of claim 6, wherein the base portion ofthe foot member is welded to the boom assembly.
 11. The turret assemblyof claim 2, wherein the foot member is a cast member.
 12. A machinecomprising: a turret assembly for supporting a moveable boom assembly,the turret assembly comprising: a base assembly structured and arrangedfor selective rotation; a swing motor being attached to the baseassembly and having a housing portion projecting outward from the baseassembly in a direction towards the boom assembly; and a mount assemblyhaving a forward attachment portion, a rearward attachment portion and ahinge portion defined therebetween, the hinge portion of the mountassembly configured to support the moveable boom assembly coupledthereto; and a foot member coupled to the boom assembly and pivotallycoupled to the hinge portion of the mount assembly, the foot memberconfigured to define a recess so that the boom assembly provides aclearance with respect to the housing portion of the swing motor;wherein the forward attachment portion and the hinge portion beingstructured and arranged to define a recess pocket, the swing motor beingat least partially disposed within the recess pocket.
 13. The machine ofclaim 12, wherein the housing portion of the swing motor is completelyenclosed within the recess pocket defined by the forward attachmentportion and the hinge portion of the mount assembly.
 14. The machine ofclaim 12, wherein the foot member comprises a first leg member and asecond leg member configured to be pivotally coupled to the mountassembly.
 15. The machine of claim 14, wherein the mount assemblycomprises: a first mounting member configured to be detachably coupledto the first leg member of the foot member; and a second mounting memberconfigured to be detachably coupled to the second leg member of the footmember.
 16. The machine of claim 12, wherein the foot member is weldedto the boom assembly.
 17. The machine of claim 12, wherein the footmember is a cast member.
 18. A turret assembly for supporting a moveableboom assembly, the turret assembly comprising: a base assemblystructured and arranged for selective rotation; a swing motor beingattached to the base assembly and having a housing portion projectingoutward from the base assembly in a direction towards the boom assembly;and a mount assembly having a forward attachment portion, a rearwardattachment portion and a hinge portion defined therebetween, the hingeportion of the mount assembly configured to support the moveable boomassembly coupled thereto, a foot member coupled to the boom assembly andpivotally coupled to the mount assembly in order to allow the boomassembly to move between a first position and a second position relativeto the base assembly, wherein, in the first position, the foot member isdistal to the swing motor, and wherein, in the second position, the footmember is proximate to the swing motor, the foot member comprising: abase portion; a first leg member extending from the base portion, thefirst leg member pivotally coupled to a first mounting member of themounting assembly; and a second leg member spaced apart from the firstleg member, the second leg member extending from the base portion andpivotally coupled to a second mounting member of the mounting assembly,wherein the first and second leg members are configured to define arecess therebetween; wherein the recess is adapted to at least partiallyaccommodate the swing motor therein in the second position of the boomassembly, and wherein the swing motor is at least partially disposedbetween the hinge portion and the forward attachment portion of each ofthe first and second mounting members.
 19. The turret assembly of claim18, wherein the base portion of the foot member is welded to the boomassembly.
 20. The turret assembly of claim 18, wherein the foot memberis a cast member.